Basic error with package organization

Hello,

i'm starting my first project in GWT and i'm facing a basic issue.
I put my files under the packages like the picture i've send.

And I'm getting the following error:

15:56:08.364 [ERROR] [trilhadosweb2] Line 44: No source code is
available for type trilhadosW.server.Business.dadosMestres.TipoLocal;
did you forget to inherit a required module?

Where is my error?

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